I've done similar amounts of work before, and I can tell you from a year-long experience going to comp sci school 8-10 hours a day (usually taking extra classes), working another 6-8 hours on top of that to pay the bills, sleeping 4-6 hours, and using whatever scraps of time left over on homework and a significant other that this is going to leave you worse off than that and it may drive you and your cofounder apart. What did I get out of that? A year that I don't remember and a year I never want to repeat again.
I would take 8-10 hours/day of intense, highly focused work on something I love over 15+ hours/day of work on something that doesn't seem to be really, really fascinating/engaging/interesting to you. All that I see you really being passionate about from your question is working a ton of hours each day to try to get something that you may not 100% enjoy out the door so you can focus on the next thing.
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This is a killer recipe for burnout.
I've done similar amounts of work before, and I can tell you from a year-long experience going to comp sci school 8-10 hours a day (usually taking extra classes), working another 6-8 hours on top of that to pay the bills, sleeping 4-6 hours, and using whatever scraps of time left over on homework and a significant other that this is going to leave you worse off than that and it may drive you and your cofounder apart. What did I get out of that? A year that I don't remember and a year I never want to repeat again.
I would take 8-10 hours/day of intense, highly focused work on something I love over 15+ hours/day of work on something that doesn't seem to be really, really fascinating/engaging/interesting to you. All that I see you really being passionate about from your question is working a ton of hours each day to try to get something that you may not 100% enjoy out the door so you can focus on the next thing.